/**
 * @class Ext.chart.series.Line
 * @extends Ext.chart.series.Cartesian
 *
 * Creates a Line Chart. A Line Chart is a useful visualization technique to display quantitative information for different
 * categories or other real values (as opposed to the bar chart), that can show some progression (or regression) in the dataset.
 * As with all other series, the Line Series must be appended in the *series* Chart array configuration. See the Chart
 * documentation for more information. A typical configuration object for the line series could be:
 *
 *     @example
 *     var store = Ext.create('Ext.data.JsonStore', {
 *         fields: ['name', 'data1', 'data2', 'data3', 'data4', 'data5'],
 *         data: [
 *             { 'name': 'metric one',   'data1': 10, 'data2': 12, 'data3': 14, 'data4': 8,  'data5': 13 },
 *             { 'name': 'metric two',   'data1': 7,  'data2': 8,  'data3': 16, 'data4': 10, 'data5': 3  },
 *             { 'name': 'metric three', 'data1': 5,  'data2': 2,  'data3': 14, 'data4': 12, 'data5': 7  },
 *             { 'name': 'metric four',  'data1': 2,  'data2': 14, 'data3': 6,  'data4': 1,  'data5': 23 },
 *             { 'name': 'metric five',  'data1': 4,  'data2': 4,  'data3': 36, 'data4': 13, 'data5': 33 }
 *         ]
 *     });
 *
 *     Ext.create('Ext.chart.Chart', {
 *         renderTo: Ext.getBody(),
 *         width: 500,
 *         height: 300,
 *         animate: true,
 *         store: store,
 *         axes: [
 *             {
 *                 type: 'Numeric',
 *                 position: 'left',
 *                 fields: ['data1', 'data2'],
 *                 label: {
 *                     renderer: Ext.util.Format.numberRenderer('0,0')
 *                 },
 *                 title: 'Sample Values',
 *                 grid: true,
 *                 minimum: 0
 *             },
 *             {
 *                 type: 'Category',
 *                 position: 'bottom',
 *                 fields: ['name'],
 *                 title: 'Sample Metrics'
 *             }
 *         ],
 *         series: [
 *             {
 *                 type: 'line',
 *                 highlight: {
 *                     size: 7,
 *                     radius: 7
 *                 },
 *                 axis: 'left',
 *                 xField: 'name',
 *                 yField: 'data1',
 *                 markerConfig: {
 *                     type: 'cross',
 *                     size: 4,
 *                     radius: 4,
 *                     'stroke-width': 0
 *                 }
 *             },
 *             {
 *                 type: 'line',
 *                 highlight: {
 *                     size: 7,
 *                     radius: 7
 *                 },
 *                 axis: 'left',
 *                 fill: true,
 *                 xField: 'name',
 *                 yField: 'data2',
 *                 markerConfig: {
 *                     type: 'circle',
 *                     size: 4,
 *                     radius: 4,
 *                     'stroke-width': 0
 *                 }
 *             }
 *         ]
 *     });
 *
 * In this configuration we're adding two series (or lines), one bound to the `data1`
 * property of the store and the other to `data3`. The type for both configurations is
 * `line`. The `xField` for both series is the same, the name propert of the store.
 * Both line series share the same axis, the left axis. You can set particular marker
 * configuration by adding properties onto the markerConfig object. Both series have
 * an object as highlight so that markers animate smoothly to the properties in highlight
 * when hovered. The second series has `fill=true` which means that the line will also
 * have an area below it of the same color.
 *
 * **Note:** In the series definition remember to explicitly set the axis to bind the
 * values of the line series to. This can be done by using the `axis` configuration property.
 */
Ext.define('Ext.chart.series.Line', {

    /* Begin Definitions */

    extend: 'Ext.chart.series.Cartesian',

    alternateClassName: ['Ext.chart.LineSeries', 'Ext.chart.LineChart'],

    requires: ['Ext.chart.axis.Axis', 'Ext.chart.Shape', 'Ext.draw.Draw', 'Ext.fx.Anim'],

    /* End Definitions */

    type: 'line',

    alias: 'series.line',

    /**
     * @cfg {String} axis
     * The position of the axis to bind the values to. Possible values are 'left', 'bottom', 'top' and 'right'.
     * You must explicitly set this value to bind the values of the line series to the ones in the axis, otherwise a
     * relative scale will be used.
     */

    /**
     * @cfg {Number} selectionTolerance
     * The offset distance from the cursor position to the line series to trigger events (then used for highlighting series, etc).
     */
    selectionTolerance: 20,

    /**
     * @cfg {Boolean} showMarkers
     * Whether markers should be displayed at the data points along the line. If true,
     * then the {@link #markerConfig} config item will determine the markers' styling.
     */
    showMarkers: true,

    /**
     * @cfg {Object} markerConfig
     * The display style for the markers. Only used if {@link #showMarkers} is true.
     * The markerConfig is a configuration object containing the same set of properties defined in
     * the Sprite class. For example, if we were to set red circles as markers to the line series we could
     * pass the object:
     *
     <pre><code>
        markerConfig: {
            type: 'circle',
            radius: 4,
            'fill': '#f00'
        }
     </code></pre>

     */
    markerConfig: {},

    /**
     * @cfg {Object} style
     * An object containing style properties for the visualization lines and fill.
     * These styles will override the theme styles.  The following are valid style properties:
     *
     * - `stroke` - an rgb or hex color string for the background color of the line
     * - `stroke-width` - the width of the stroke (integer)
     * - `fill` - the background fill color string (hex or rgb), only works if {@link #fill} is `true`
     * - `opacity` - the opacity of the line and the fill color (decimal)
     *
     * Example usage:
     *
     *     style: {
     *         stroke: '#00ff00',
     *         'stroke-width': 10,
     *         fill: '#80A080',
     *         opacity: 0.2
     *     }
     */
    style: {},

    /**
     * @cfg {Boolean/Number} smooth
     * If set to `true` or a non-zero number, the line will be smoothed/rounded around its points; otherwise
     * straight line segments will be drawn.
     *
     * A numeric value is interpreted as a divisor of the horizontal distance between consecutive points in
     * the line; larger numbers result in sharper curves while smaller numbers result in smoother curves.
     *
     * If set to `true` then a default numeric value of 3 will be used. Defaults to `false`.
     */
    smooth: false,

    /**
     * @private Default numeric smoothing value to be used when {@link #smooth} = true.
     */
    defaultSmoothness: 3,

    /**
     * @cfg {Boolean} fill
     * If true, the area below the line will be filled in using the {@link #style eefill} and
     * {@link #style opacity} config properties. Defaults to false.
     */
    fill: false,

    constructor: function(config) {
        this.callParent(arguments);
        var me = this,
            surface = me.chart.surface,
            shadow = me.chart.shadow,
            i, l;
        config.highlightCfg = Ext.Object.merge({ 'stroke-width': 3 }, config.highlightCfg);
        Ext.apply(me, config, {
            shadowAttributes: [{
                "stroke-width": 6,
                "stroke-opacity": 0.05,
                stroke: 'rgb(0, 0, 0)',
                translate: {
                    x: 1,
                    y: 1
                }
            }, {
                "stroke-width": 4,
                "stroke-opacity": 0.1,
                stroke: 'rgb(0, 0, 0)',
                translate: {
                    x: 1,
                    y: 1
                }
            }, {
                "stroke-width": 2,
                "stroke-opacity": 0.15,
                stroke: 'rgb(0, 0, 0)',
                translate: {
                    x: 1,
                    y: 1
                }
            }]
        });
        me.group = surface.getGroup(me.seriesId);
        if (me.showMarkers) {
            me.markerGroup = surface.getGroup(me.seriesId + '-markers');
        }
        if (shadow) {
            for (i = 0, l = me.shadowAttributes.length; i < l; i++) {
                me.shadowGroups.push(surface.getGroup(me.seriesId + '-shadows' + i));
            }
        }
    },

    // @private makes an average of points when there are more data points than pixels to be rendered.
    shrink: function(xValues, yValues, size) {
        // Start at the 2nd point...
        var len = xValues.length,
            ratio = Math.floor(len / size),
            i = 1,
            xSum = 0,
            ySum = 0,
            xRes = [xValues[0]],
            yRes = [yValues[0]];

        for (; i < len; ++i) {
            xSum += xValues[i] || 0;
            ySum += yValues[i] || 0;
            if (i % ratio == 0) {
                xRes.push(xSum/ratio);
                yRes.push(ySum/ratio);
                xSum = 0;
                ySum = 0;
            }
        }
        return {
            x: xRes,
            y: yRes
        };
    },

    /**
     * Draws the series for the current chart.
     */
    drawSeries: function() {
        var me = this,
            chart = me.chart,
            chartAxes = chart.axes,
            store = chart.getChartStore(),
            storeCount = store.getCount(),
            surface = me.chart.surface,
            bbox = {},
            group = me.group,
            showMarkers = me.showMarkers,
            markerGroup = me.markerGroup,
            enableShadows = chart.shadow,
            shadowGroups = me.shadowGroups,
            shadowAttributes = me.shadowAttributes,
            smooth = me.smooth,
            lnsh = shadowGroups.length,
            dummyPath = ["M"],
            path = ["M"],
            renderPath = ["M"],
            smoothPath = ["M"],
            markerIndex = chart.markerIndex,
            axes = [].concat(me.axis),
            shadowBarAttr,
            xValues = [],
            xValueMap = {},
            yValues = [],
            yValueMap = {},
            onbreak = false,
            storeIndices = [],
            markerStyle = me.markerStyle,
            seriesStyle = me.seriesStyle,
            colorArrayStyle = me.colorArrayStyle,
            colorArrayLength = colorArrayStyle && colorArrayStyle.length || 0,
            isNumber = Ext.isNumber,
            seriesIdx = me.seriesIdx, 
            boundAxes = me.getAxesForXAndYFields(),
            boundXAxis = boundAxes.xAxis,
            boundYAxis = boundAxes.yAxis,
            shadows, shadow, shindex, fromPath, fill, fillPath, rendererAttributes,
            x, y, prevX, prevY, firstX, firstY, markerCount, i, j, ln, axis, ends, marker, markerAux, item, xValue,
            yValue, coords, xScale, yScale, minX, maxX, minY, maxY, line, animation, endMarkerStyle,
            endLineStyle, type, count;

        if (me.fireEvent('beforedraw', me) === false) {
            return;
        }

        //if store is empty or the series is excluded in the legend then there's nothing to draw.
        if (!storeCount || me.seriesIsHidden) {
            me.hide();
            me.items = [];
            if (me.line) {
                me.line.hide(true);
                if (me.line.shadows) {
                    shadows = me.line.shadows;
                    for (j = 0, lnsh = shadows.length; j < lnsh; j++) {
                        shadow = shadows[j];
                        shadow.hide(true);
                    }
                }
                if (me.fillPath) {
                    me.fillPath.hide(true);
                }
            }
            me.line = null;
            me.fillPath = null;
            return;
        }

        //prepare style objects for line and markers
        endMarkerStyle = Ext.apply(markerStyle || {}, me.markerConfig, {
            fill: me.seriesStyle.fill || colorArrayStyle[seriesIdx % colorArrayStyle.length]
        });
        type = endMarkerStyle.type;
        delete endMarkerStyle.type;
        endLineStyle = seriesStyle;
        //if no stroke with is specified force it to 0.5 because this is
        //about making *lines*
        if (!endLineStyle['stroke-width']) {
            endLineStyle['stroke-width'] = 0.5;
        }
        //If we're using a time axis and we need to translate the points,
        //then reuse the first markers as the last markers.
        if (markerIndex && markerGroup && markerGroup.getCount()) {
            for (i = 0; i < markerIndex; i++) {
                marker = markerGroup.getAt(i);
                markerGroup.remove(marker);
                markerGroup.add(marker);
                markerAux = markerGroup.getAt(markerGroup.getCount() - 2);
                marker.setAttributes({
                    x: 0,
                    y: 0,
                    translate: {
                        x: markerAux.attr.translation.x,
                        y: markerAux.attr.translation.y
                    }
                }, true);
            }
        }

        me.unHighlightItem();
        me.cleanHighlights();

        me.setBBox();
        bbox = me.bbox;
        me.clipRect = [bbox.x, bbox.y, bbox.width, bbox.height];
        for (i = 0, ln = axes.length; i < ln; i++) {
            axis = chartAxes.get(axes[i]);
            if (axis) {
                ends = axis.calcEnds();
                if (axis.position == 'top' || axis.position == 'bottom') {
                    minX = ends.from;
                    maxX = ends.to;
                }
                else {
                    minY = ends.from;
                    maxY = ends.to;
                }
            }
        }
        // If a field was specified without a corresponding axis, create one to get bounds
        //only do this for the axis where real values are bound (that's why we check for
        //me.axis)
        if (me.xField && !isNumber(minX) &&
            (boundXAxis == 'bottom' || boundXAxis == 'top') && 
            !chartAxes.get(boundXAxis)) {
            axis = Ext.create('Ext.chart.axis.Axis', {
                chart: chart,
                fields: [].concat(me.xField)
            }).calcEnds();
            minX = axis.from;
            maxX = axis.to;
        }
        if (me.yField && !isNumber(minY) &&
            (boundYAxis == 'right' || boundYAxis == 'left') &&
            !chartAxes.get(boundYAxis)) {
            axis = Ext.create('Ext.chart.axis.Axis', {
                chart: chart,
                fields: [].concat(me.yField)
            }).calcEnds();
            minY = axis.from;
            maxY = axis.to;
        }
        if (isNaN(minX)) {
            minX = 0;
            xScale = bbox.width / ((storeCount - 1) || 1);
        }
        else {
            xScale = bbox.width / ((maxX - minX) || (storeCount -1) || 1);
        }

        if (isNaN(minY)) {
            minY = 0;
            yScale = bbox.height / ((storeCount - 1) || 1);
        }
        else {
            yScale = bbox.height / ((maxY - minY) || (storeCount - 1) || 1);
        }

        // Extract all x and y values from the store
        me.eachRecord(function(record, i) {
            xValue = record.get(me.xField);

            // Ensure a value
            if (typeof xValue == 'string' || typeof xValue == 'object' && !Ext.isDate(xValue)
                //set as uniform distribution if the axis is a category axis.
                || boundXAxis && chartAxes.get(boundXAxis) && chartAxes.get(boundXAxis).type == 'Category') {
                    if (xValue in xValueMap) {
                        xValue = xValueMap[xValue];
                    } else {
                        xValue = xValueMap[xValue] = i;
                    }
            }

            // Filter out values that don't fit within the pan/zoom buffer area
            yValue = record.get(me.yField);
            //skip undefined values
            if (typeof yValue == 'undefined' || (typeof yValue == 'string' && !yValue)) {
                //<debug warn>
                if (Ext.isDefined(Ext.global.console)) {
                    Ext.global.console.warn("[Ext.chart.series.Line]  Skipping a store element with an undefined value at ", record, xValue, yValue);
                }
                //</debug>
                return;
            }
            // Ensure a value
            if (typeof yValue == 'string' || typeof yValue == 'object' && !Ext.isDate(yValue)
                //set as uniform distribution if the axis is a category axis.
                || boundYAxis && chartAxes.get(boundYAxis) && chartAxes.get(boundYAxis).type == 'Category') {
                yValue = i;
            }
            storeIndices.push(i);
            xValues.push(xValue);
            yValues.push(yValue);
        });

        ln = xValues.length;
        if (ln > bbox.width) {
            coords = me.shrink(xValues, yValues, bbox.width);
            xValues = coords.x;
            yValues = coords.y;
        }

        me.items = [];

        count = 0;
        ln = xValues.length;
        for (i = 0; i < ln; i++) {
            xValue = xValues[i];
            yValue = yValues[i];
            if (yValue === false) {
                if (path.length == 1) {
                    path = [];
                }
                onbreak = true;
                me.items.push(false);
                continue;
            } else {
                x = (bbox.x + (xValue - minX) * xScale).toFixed(2);
                y = ((bbox.y + bbox.height) - (yValue - minY) * yScale).toFixed(2);
                if (onbreak) {
                    onbreak = false;
                    path.push('M');
                }
                path = path.concat([x, y]);
            }
            if ((typeof firstY == 'undefined') && (typeof y != 'undefined')) {
                firstY = y;
                firstX = x;
            }
            // If this is the first line, create a dummypath to animate in from.
            if (!me.line || chart.resizing) {
                dummyPath = dummyPath.concat([x, bbox.y + bbox.height / 2]);
            }

            // When resizing, reset before animating
            if (chart.animate && chart.resizing && me.line) {
                me.line.setAttributes({
                    path: dummyPath
                }, true);
                if (me.fillPath) {
                    me.fillPath.setAttributes({
                        path: dummyPath,
                        opacity: 0.2
                    }, true);
                }
                if (me.line.shadows) {
                    shadows = me.line.shadows;
                    for (j = 0, lnsh = shadows.length; j < lnsh; j++) {
                        shadow = shadows[j];
                        shadow.setAttributes({
                            path: dummyPath
                        }, true);
                    }
                }
            }
            if (showMarkers) {
                marker = markerGroup.getAt(count++);
                if (!marker) {
                    marker = Ext.chart.Shape[type](surface, Ext.apply({
                        group: [group, markerGroup],
                        x: 0, y: 0,
                        translate: {
                            x: +(prevX || x),
                            y: prevY || (bbox.y + bbox.height / 2)
                        },
                        value: '"' + xValue + ', ' + yValue + '"',
                        zIndex: 4000
                    }, endMarkerStyle));
                    marker._to = {
                        translate: {
                            x: +x,
                            y: +y
                        }
                    };
                } else {
                    marker.setAttributes({
                        value: '"' + xValue + ', ' + yValue + '"',
                        x: 0, y: 0,
                        hidden: false
                    }, true);
                    marker._to = {
                        translate: {
                            x: +x, 
                            y: +y
                        }
                    };
                }
            }
            me.items.push({
                series: me,
                value: [xValue, yValue],
                point: [x, y],
                sprite: marker,
                storeItem: store.getAt(storeIndices[i])
            });
            prevX = x;
            prevY = y;
        }

        if (path.length <= 1) {
            //nothing to be rendered
            return;
        }

        if (me.smooth) {
            smoothPath = Ext.draw.Draw.smooth(path, isNumber(smooth) ? smooth : me.defaultSmoothness);
        }

        renderPath = smooth ? smoothPath : path;

        //Correct path if we're animating timeAxis intervals
        if (chart.markerIndex && me.previousPath) {
            fromPath = me.previousPath;
            if (!smooth) {
                Ext.Array.erase(fromPath, 1, 2);
            }
        } else {
            fromPath = path;
        }

        // Only create a line if one doesn't exist.
        if (!me.line) {
            me.line = surface.add(Ext.apply({
                type: 'path',
                group: group,
                path: dummyPath,
                stroke: endLineStyle.stroke || endLineStyle.fill
            }, endLineStyle || {}));

            if (enableShadows) {
                me.line.setAttributes(Ext.apply({}, me.shadowOptions), true);
            }

            //unset fill here (there's always a default fill withing the themes).
            me.line.setAttributes({
                fill: 'none',
                zIndex: 3000
            });
            if (!endLineStyle.stroke && colorArrayLength) {
                me.line.setAttributes({
                    stroke: colorArrayStyle[seriesIdx % colorArrayLength]
                }, true);
            }
            if (enableShadows) {
                //create shadows
                shadows = me.line.shadows = [];
                for (shindex = 0; shindex < lnsh; shindex++) {
                    shadowBarAttr = shadowAttributes[shindex];
                    shadowBarAttr = Ext.apply({}, shadowBarAttr, { path: dummyPath });
                    shadow = surface.add(Ext.apply({}, {
                        type: 'path',
                        group: shadowGroups[shindex]
                    }, shadowBarAttr));
                    shadows.push(shadow);
                }
            }
        }
        if (me.fill) {
            fillPath = renderPath.concat([
                ["L", x, bbox.y + bbox.height],
                ["L", firstX, bbox.y + bbox.height],
                ["L", firstX, firstY]
            ]);
            if (!me.fillPath) {
                me.fillPath = surface.add({
                    group: group,
                    type: 'path',
                    opacity: endLineStyle.opacity || 0.3,
                    fill: endLineStyle.fill || colorArrayStyle[seriesIdx % colorArrayLength],
                    path: dummyPath
                });
            }
        }
        markerCount = showMarkers && markerGroup.getCount();
        if (chart.animate) {
            fill = me.fill;
            line = me.line;
            //Add renderer to line. There is not unique record associated with this.
            rendererAttributes = me.renderer(line, false, { path: renderPath }, i, store);
            Ext.apply(rendererAttributes, endLineStyle || {}, {
                stroke: endLineStyle.stroke || endLineStyle.fill
            });
            //fill should not be used here but when drawing the special fill path object
            delete rendererAttributes.fill;
            line.show(true);
            if (chart.markerIndex && me.previousPath) {
                me.animation = animation = me.onAnimate(line, {
                    to: rendererAttributes,
                    from: {
                        path: fromPath
                    }
                });
            } else {
                me.animation = animation = me.onAnimate(line, {
                    to: rendererAttributes
                });
            }
            //animate shadows
            if (enableShadows) {
                shadows = line.shadows;
                for(j = 0; j < lnsh; j++) {
                    shadows[j].show(true);
                    if (chart.markerIndex && me.previousPath) {
                        me.onAnimate(shadows[j], {
                            to: { path: renderPath },
                            from: { path: fromPath }
                        });
                    } else {
                        me.onAnimate(shadows[j], {
                            to: { path: renderPath }
                        });
                    }
                }
            }
            //animate fill path
            if (fill) {
                me.fillPath.show(true);
                me.onAnimate(me.fillPath, {
                    to: Ext.apply({}, {
                        path: fillPath,
                        fill: endLineStyle.fill || colorArrayStyle[seriesIdx % colorArrayLength],
                        'stroke-width': 0
                    }, endLineStyle || {})
                });
            }
            //animate markers
            if (showMarkers) {
                count = 0;
                for(i = 0; i < ln; i++) {
                    if (me.items[i]) {
                        item = markerGroup.getAt(count++);
                        if (item) {
                            rendererAttributes = me.renderer(item, store.getAt(i), item._to, i, store);
                            me.onAnimate(item, {
                                to: Ext.apply(rendererAttributes, endMarkerStyle || {})
                            });
                            item.show(true);
                        }
                    }
                }
                for(; count < markerCount; count++) {
                    item = markerGroup.getAt(count);
                    item.hide(true);
                }
//                for(i = 0; i < (chart.markerIndex || 0)-1; i++) {
//                    item = markerGroup.getAt(i);
//                    item.hide(true);
//                }
            }
        } else {
            rendererAttributes = me.renderer(me.line, false, { path: renderPath, hidden: false }, i, store);
            Ext.apply(rendererAttributes, endLineStyle || {}, {
                stroke: endLineStyle.stroke || endLineStyle.fill
            });
            //fill should not be used here but when drawing the special fill path object
            delete rendererAttributes.fill;
            me.line.setAttributes(rendererAttributes, true);
            //set path for shadows
            if (enableShadows) {
                shadows = me.line.shadows;
                for(j = 0; j < lnsh; j++) {
                    shadows[j].setAttributes({
                        path: renderPath,
                        hidden: false
                    }, true);
                }
            }
            if (me.fill) {
                me.fillPath.setAttributes({
                    path: fillPath,
                    hidden: false
                }, true);
            }
            if (showMarkers) {
                count = 0;
                for(i = 0; i < ln; i++) {
                    if (me.items[i]) {
                        item = markerGroup.getAt(count++);
                        if (item) {
                            rendererAttributes = me.renderer(item, store.getAt(i), item._to, i, store);
                            item.setAttributes(Ext.apply(endMarkerStyle || {}, rendererAttributes || {}), true);
                            item.show(true);
                        }
                    }
                }
                for(; count < markerCount; count++) {
                    item = markerGroup.getAt(count);
                    item.hide(true);
                }
            }
        }

        if (chart.markerIndex) {
            if (me.smooth) {
                Ext.Array.erase(path, 1, 2);
            } else {
                Ext.Array.splice(path, 1, 0, path[1], path[2]);
            }
            me.previousPath = path;
        }
        me.renderLabels();
        me.renderCallouts();

        me.fireEvent('draw', me);
    },

    // @private called when a label is to be created.
    onCreateLabel: function(storeItem, item, i, display) {
        var me = this,
            group = me.labelsGroup,
            config = me.label,
            bbox = me.bbox,
            endLabelStyle = Ext.apply(config, me.seriesLabelStyle);

        return me.chart.surface.add(Ext.apply({
            'type': 'text',
            'text-anchor': 'middle',
            'group': group,
            'x': item.point[0],
            'y': bbox.y + bbox.height / 2
        }, endLabelStyle || {}));
    },

    // @private called when a label is to be created.
    onPlaceLabel: function(label, storeItem, item, i, display, animate) {
        var me = this,
            chart = me.chart,
            resizing = chart.resizing,
            config = me.label,
            format = config.renderer,
            field = config.field,
            bbox = me.bbox,
            x = item.point[0],
            y = item.point[1],
            radius = item.sprite.attr.radius,
            bb, width, height;

        label.setAttributes({
            text: format(storeItem.get(field)),
            hidden: true
        }, true);

        if (display == 'rotate') {
            label.setAttributes({
                'text-anchor': 'start',
                'rotation': {
                    x: x,
                    y: y,
                    degrees: -45
                }
            }, true);
            //correct label position to fit into the box
            bb = label.getBBox();
            width = bb.width;
            height = bb.height;
            x = x < bbox.x? bbox.x : x;
            x = (x + width > bbox.x + bbox.width)? (x - (x + width - bbox.x - bbox.width)) : x;
            y = (y - height < bbox.y)? bbox.y + height : y;

        } else if (display == 'under' || display == 'over') {
            //TODO(nicolas): find out why width/height values in circle bounding boxes are undefined.
            bb = item.sprite.getBBox();
            bb.width = bb.width || (radius * 2);
            bb.height = bb.height || (radius * 2);
            y = y + (display == 'over'? -bb.height : bb.height);
            //correct label position to fit into the box
            bb = label.getBBox();
            width = bb.width/2;
            height = bb.height/2;
            x = x - width < bbox.x? bbox.x + width : x;
            x = (x + width > bbox.x + bbox.width) ? (x - (x + width - bbox.x - bbox.width)) : x;
            y = y - height < bbox.y? bbox.y + height : y;
            y = (y + height > bbox.y + bbox.height) ? (y - (y + height - bbox.y - bbox.height)) : y;
        }

        if (me.chart.animate && !me.chart.resizing) {
            label.show(true);
            me.onAnimate(label, {
                to: {
                    x: x,
                    y: y
                }
            });
        } else {
            label.setAttributes({
                x: x,
                y: y
            }, true);
            if (resizing && me.animation) {
                me.animation.on('afteranimate', function() {
                    label.show(true);
                });
            } else {
                label.show(true);
            }
        }
    },

    // @private Overriding highlights.js highlightItem method.
    highlightItem: function() {
        var me = this;
        me.callParent(arguments);
        if (me.line && !me.highlighted) {
            if (!('__strokeWidth' in me.line)) {
                me.line.__strokeWidth = parseFloat(me.line.attr['stroke-width']) || 0;
            }
            if (me.line.__anim) {
                me.line.__anim.paused = true;
            }
            me.line.__anim = Ext.create('Ext.fx.Anim', {
                target: me.line,
                to: {
                    'stroke-width': me.line.__strokeWidth + 3
                }
            });
            me.highlighted = true;
        }
    },

    // @private Overriding highlights.js unHighlightItem method.
    unHighlightItem: function() {
        var me = this;
        me.callParent(arguments);
        if (me.line && me.highlighted) {
            me.line.__anim = Ext.create('Ext.fx.Anim', {
                target: me.line,
                to: {
                    'stroke-width': me.line.__strokeWidth
                }
            });
            me.highlighted = false;
        }
    },

    // @private called when a callout needs to be placed.
    onPlaceCallout : function(callout, storeItem, item, i, display, animate, index) {
        if (!display) {
            return;
        }

        var me = this,
            chart = me.chart,
            surface = chart.surface,
            resizing = chart.resizing,
            config = me.callouts,
            items = me.items,
            prev = i == 0? false : items[i -1].point,
            next = (i == items.length -1)? false : items[i +1].point,
            cur = [+item.point[0], +item.point[1]],
            dir, norm, normal, a, aprev, anext,
            offsetFromViz = config.offsetFromViz || 30,
            offsetToSide = config.offsetToSide || 10,
            offsetBox = config.offsetBox || 3,
            boxx, boxy, boxw, boxh,
            p, clipRect = me.clipRect,
            bbox = {
                width: config.styles.width || 10,
                height: config.styles.height || 10
            },
            x, y;

        //get the right two points
        if (!prev) {
            prev = cur;
        }
        if (!next) {
            next = cur;
        }
        a = (next[1] - prev[1]) / (next[0] - prev[0]);
        aprev = (cur[1] - prev[1]) / (cur[0] - prev[0]);
        anext = (next[1] - cur[1]) / (next[0] - cur[0]);

        norm = Math.sqrt(1 + a * a);
        dir = [1 / norm, a / norm];
        normal = [-dir[1], dir[0]];

        //keep the label always on the outer part of the "elbow"
        if (aprev > 0 && anext < 0 && normal[1] < 0
            || aprev < 0 && anext > 0 && normal[1] > 0) {
            normal[0] *= -1;
            normal[1] *= -1;
        } else if (Math.abs(aprev) < Math.abs(anext) && normal[0] < 0
                   || Math.abs(aprev) > Math.abs(anext) && normal[0] > 0) {
            normal[0] *= -1;
            normal[1] *= -1;
        }
        //position
        x = cur[0] + normal[0] * offsetFromViz;
        y = cur[1] + normal[1] * offsetFromViz;

        //box position and dimensions
        boxx = x + (normal[0] > 0? 0 : -(bbox.width + 2 * offsetBox));
        boxy = y - bbox.height /2 - offsetBox;
        boxw = bbox.width + 2 * offsetBox;
        boxh = bbox.height + 2 * offsetBox;

        //now check if we're out of bounds and invert the normal vector correspondingly
        //this may add new overlaps between labels (but labels won't be out of bounds).
        if (boxx < clipRect[0] || (boxx + boxw) > (clipRect[0] + clipRect[2])) {
            normal[0] *= -1;
        }
        if (boxy < clipRect[1] || (boxy + boxh) > (clipRect[1] + clipRect[3])) {
            normal[1] *= -1;
        }

        //update positions
        x = cur[0] + normal[0] * offsetFromViz;
        y = cur[1] + normal[1] * offsetFromViz;

        //update box position and dimensions
        boxx = x + (normal[0] > 0? 0 : -(bbox.width + 2 * offsetBox));
        boxy = y - bbox.height /2 - offsetBox;
        boxw = bbox.width + 2 * offsetBox;
        boxh = bbox.height + 2 * offsetBox;

        if (chart.animate) {
            //set the line from the middle of the pie to the box.
            me.onAnimate(callout.lines, {
                to: {
                    path: ["M", cur[0], cur[1], "L", x, y, "Z"]
                }
            });
            //set component position
            if (callout.panel) {
                callout.panel.setPosition(boxx, boxy, true);
            }
        }
        else {
            //set the line from the middle of the pie to the box.
            callout.lines.setAttributes({
                path: ["M", cur[0], cur[1], "L", x, y, "Z"]
            }, true);
            //set component position
            if (callout.panel) {
                callout.panel.setPosition(boxx, boxy);
            }
        }
        for (p in callout) {
            callout[p].show(true);
        }
    },

    isItemInPoint: function(x, y, item, i) {
        var me = this,
            items = me.items,
            tolerance = me.selectionTolerance,
            result = null,
            prevItem,
            nextItem,
            prevPoint,
            nextPoint,
            ln,
            x1,
            y1,
            x2,
            y2,
            xIntersect,
            yIntersect,
            dist1, dist2, dist, midx, midy,
            sqrt = Math.sqrt, abs = Math.abs;

        nextItem = items[i];
        prevItem = i && items[i - 1];

        if (i >= ln) {
            prevItem = items[ln - 1];
        }
        prevPoint = prevItem && prevItem.point;
        nextPoint = nextItem && nextItem.point;
        x1 = prevItem ? prevPoint[0] : nextPoint[0] - tolerance;
        y1 = prevItem ? prevPoint[1] : nextPoint[1];
        x2 = nextItem ? nextPoint[0] : prevPoint[0] + tolerance;
        y2 = nextItem ? nextPoint[1] : prevPoint[1];
        dist1 = sqrt((x - x1) * (x - x1) + (y - y1) * (y - y1));
        dist2 = sqrt((x - x2) * (x - x2) + (y - y2) * (y - y2));
        dist = Math.min(dist1, dist2);

        if (dist <= tolerance) {
            return dist == dist1? prevItem : nextItem;
        }
        return false;
    },

    // @private toggle visibility of all series elements (markers, sprites).
    toggleAll: function(show) {
        var me = this,
            i, ln, shadow, shadows;
        if (!show) {
            Ext.chart.series.Cartesian.prototype.hideAll.call(me);
        }
        else {
            Ext.chart.series.Cartesian.prototype.showAll.call(me);
        }
        if (me.line) {
            me.line.setAttributes({
                hidden: !show
            }, true);
            //hide shadows too
            if (me.line.shadows) {
                for (i = 0, shadows = me.line.shadows, ln = shadows.length; i < ln; i++) {
                    shadow = shadows[i];
                    shadow.setAttributes({
                        hidden: !show
                    }, true);
                }
            }
        }
        if (me.fillPath) {
            me.fillPath.setAttributes({
                hidden: !show
            }, true);
        }
    },

    // @private hide all series elements (markers, sprites).
    hideAll: function() {
        this.toggleAll(false);
    },

    // @private hide all series elements (markers, sprites).
    showAll: function() {
        this.toggleAll(true);
    }
});
